A volunteer program was initiated with sport fishers in the Hanford Reach and the lower Columbia River nem"Chinook, Washington. This resulted in the donation of several carcasses for radionuclide analysis. Additio,aal samples were purchased from commercial fish buyers at Ilwaco, Washington. The Oregon State Police provided samples from four oversize sturgeon (> 183 cm) that were confiscated from illegal fishing activities near The Dalles Dam.When possible, total length, weight, capture date and location, sex, and degree of maturity were recorded for each fish• Age analysis was conducted using sections taken from pectoral fins as described in Hess (I984). After initial data collection in the field, fish were eviscerated, skinned, and prepared for laboratory analysis. Tissues analyzed consisted of skinless muscle fillets, liver minus gallbladder, and head cartilage. Ali samples were rinsed with distilled water, sealed in plastic bags_ and frozen for up to 12 months before analysis.